Question
The average of 7 data points is 60. If two additional data
points with average 'x' are included, the overall average increases by 15%. What is the value of 'x'?Solution
ATQ,
Sum of 7 data points = 7 × 60 = 420
New average of all the numbers = 60 × 1.15 = 69
So, sum of 9 numbers = 69 × 9 = 621
So, average of two new numbers = (621 - 420) ÷ 2 = 100.5
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